A weak lensing analysis of the Abell 2163 cluster

TL;DR

This paper performs a weak lensing analysis of the Abell 2163 galaxy cluster using deep imaging data, fitting models to derive mass and velocity dispersion, and comparing results with previous X-ray and spectroscopic studies.

Contribution

It applies weak lensing techniques to a large-scale dataset of Abell 2163, providing new mass estimates and reconciling previous contradictory findings.

Findings

Mass and velocity dispersion agree with X-ray and spectroscopic data

Provides mass estimates at various distances from the cluster center

Derives the luminosity function and mass/luminosity ratio

Abstract

Weak lensing analysis is applied to a deep, one square degree r-band CFHT-Megacam image of the Abell 2163 field. The observed shear is fitted with Single Isothermal Sphere and Navarro-Frenk-White models to obtain the velocity dispersion and the mass, respectively; in addition, aperture densitometry is also used to provide a mass estimate at different distances from the cluster centre. The luminosity function is finally derived, allowing to estimate the mass/luminosity ratio. Previous weak lensing analyses performed at smaller scales produced somewhat contradictory results. The mass and velocity dispersion obtained in the present paper are compared and found to be in good agreement with the values computed by other authors from X-ray and spectroscopic data.